Auxiliary brake for looms



June -28,v 1927. I ,633,644 B. F. McGUlNx-:ss

AUXILIARY BRAKE FOR LOOMS pru' H any:

Patented June 28, 1927.

rieur-ED STATES A1,633,644 PATENT oflfnuclar.v

BENJAMIN F. MCGUINESS, OF'GRAFTON, MASSACHUSETTS, ASSIGNOR TO' CROMPTON & KNOVVLESA LOOM WORKS, OF WORCESTER, MASSACHUSETTS, A' CORPORATION OF MASSACHUSETTS.

Application filedl December 4, 1925.

This invention relates to means for applying a light braking force to a looml to stop the same gradually andv hold the lay in for'- ward position when a fault inthe warp is-to be mended.v lt is the general object of the invention to provide an auxiliary brake operable from the shipper handle and effective to applyy light friction to stop the loom sooner than would be possible were no-brake used but without the harsh action usually attending the use of the ordinary brake.

Recent improvements in the construction of silk looms have included the use of roller bearings to improve the running of the lay at high speeds. l/ihen a break inthe war-p occurs it is desirablev to stop the lay near thel extreme forward limit of its movement so as to afford convenient accessto` the harnesses for the tying together of the .broken ends. lt is found that looms equipped with roller bearings turn over so easily that the lay tends to move backwardly to an incon venient' position. Looms of the typek mentioned are usually provided with a. brake which is effective to stop the loom quickly at the time ,of protection or when a: fault in the filling occurs but the brake is inde,- pendent ofthe shipper handle andafter the loom has been stopped it must be taken off before the shipper handle can be moved to running position. This extra operationV is objectionable and it is a' further objectof my invention to provide an auxiliary brake additional to the usual brake'to holdthelay in forward position and be under` control of the shipper handle, thus permitting the opferator to start up the loom by a single operation after the warp fault has been correeted.

lVhen rayon is used as filling it .is found. that if the lay moves backwardly after being stopped approximately at front center the filling fork of the filling stopmotion is lifted to slacken the tension on the: rayon filling. This character of filling is made ofal number of very finestrandsheld together loosely because of the fact that they are not provided with line serrations or saw tooth edges as is the case with natural libres and because of this fact any slackening of the tension is likely to result in a slightA seperation of the strands soY that the; threadv is somewhat wider in some places than; in others. Consequently when the lay is-moved AUXILIARY BRAKE FOR LOOMS.

Serial` No. 73,246'.

ypressed and as the harnesses in this type ofloom are raised against spring.v action as the loom approaches front center, the tendency of' these springs is to move the lay backwardly and it is a still' further object of my invention tof overcome the action of thev springsl on the lay by'means of the aforesaid auxiliary brake. i

`With these andy other objects in view whichA will appear as the description proceeds, my invention resides" in the vcombina-V tion and7 arrangement of parts hereinafter kdescribed, andv set forth-inthe claims.y

In the accompanying. drawings.v wherein a convenient embodiment ofY the invention is shown, y y Y A j Fig. 1 isa top plan View of one end ofl a loom. showing my invention applied to the driving mechanism therefor. 4

Fig. 2 is a vertical section on line 2 2. of Fig. 1,

F ig.A 3 isla fragmentary side elevation of a portion of Fig. 2 showing' the auxiliary brake in braking. position and the `main brake spaced from.- the brake drum,

Figs. 4, 5, and G present the shipping-and braking control mechanism on anl enlarged scale in differ-ent positions,

Fig. 'T is a verticalsection.v through a portion of' the lay and breast beam of the loom showing the manner of operation of the illing stop motion when the lay is on front center andfilling is absent, and.l f

Fig.V 8 .isI a detail top plan taken in the direction of arrow 8, Fig. 7.

Referring particularly to it will be seen` that I have provided loom sidesV l() and l1 and a lay 12 having swords 13 the lower ends of which are provid-ed wit-hroller bearings 14' mounted on a rocker shaft 15. The lay is provided 4with connectors- 16 therear ends of which are pro-l Figs.v 1 and 2.

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vided with yielding bearings 1? mounted on a wrist pin 13 on the top shaft 19. Said shaft 19 rotates in roller bearings 2O mounted on the loom frame and moves the lay toward and from breast beam 21.

The filling stop motioncomprises a bracket 30 secured to the lay 12 substantiallv the cential portion thereof. A fillingfork 3l is secured to and moves with a stub shaft 32 pivoted on the bracket and having` an arm 33 attached to the upper end of connector 34 the lower end of which the rear end of a lever 35, see lfig. l". l lever 35 moves about a stud 36 secured o the bracket and is provided with adagger 37 normally held yieldingly in raised position by spring 33 as shown in rlhe bracket 30 guides the upper end of rod 39 under the rearwardly extendino` arm of lever 35. As shown in lj ig. 2 the lower end of rod 39 is connected as at 40 to a limdpivot spaced from the rocker shaft l pro-vide a rolling rod 41 having secured theretoA a knock-off arin 42 positioned for with the dagger 37 when the latter is raised position as the lay in'oves i As the lay moves rearwardly the ca i 37 is lowered and as the lay moves forwardly the fork 3l will be held up yarn is present to hold .the daggerv down, but if yarn is absentl the fork nieves down in slot 43 in the lay with an accompanying up inotion of the dagger to engage the arm 42 and roll rod 41 to stop the -looin by inechanisin to be described. rllie lilling fori-z and its operation are very well understood in the art and a further description of the is considered unnecessary. lltisneces however, to keep in mind that as the' ay moves backwardly the filling fork 3l is moved out of the slot 43 'so as to relieve the tension of any weft which may lie under the fork.

In order to move the lay backwardly and forwardly l provide a constancy driven pinion 44 meshing with a gear rot table freely on the top shaft 19 and havg cured thereto a grooved collar 46..l A sta 47 projects laterally from the loom ne and has pivoted as at 48 a shipper lever 49 having a pin 50 which cooperates Y n coll 46 to move the gear 45 longitudinally o shaft 19 when shipper lever 49 oscillated. Pivoted on said frame 4.7 as at 5l is a bell crank lever 52 between which and the lever 49 extends an adjustable connector As shown in Fig. 2 brake lever 54 pivoted on the loom frame ends to move down under action of springs Adjustably connected to said brake lever as at 5G is the free end of a friction strap 5? the other end of which is fixed to the loom frame as aty 58. In order to hold the strap spaced from a friction drum 59 which is secured to the shaft 19 and thus'perinit -free rotation of the latter l secure to one end of rod 41 a brake handle GO. is shown in F ig. 6

said lever GO is provided with a notch G1 farther from rod 41 than a second notch 62 Aupper end of a lever 65 loosely mounted on a shipper shaft which extends across the leoni. The lower end of said lever 65 is connected to the forward end of a rod G? th .rear end of which as shcwn in Fig. 2 is connected as 68 to the brake lever 54. TVfil/hen said brake handle GO is noved to the forward position shown in Figs. 2 and 5 the notch 61 will hold the lever 55 to space the friction band 5'? from the drum 59, thus permitting free movement of shaft 19.

shown in llig. 1 there is secured to the top shaft 19 a gear 69 having a friction face 70 to engage a corresponding friction face Z 1 moving with'gear 45. ln order to move said gear 45 into driving relationship with gear 69 and shaft 19 l secure to each end of shipper shaft 56 a shipper handle 72 the lower end of which carries a pin 73 to be received in a slot 74 formed in the upper end of the lock lever 7 5 pivoted as at 76 on afined stud. Spring 77 interposed between the lower end of the locking lever and a fixed part of the loom structure tends normally to move the lock lever to the left but such nieven'ient is resisted when the loom is running by reason of the fact that pin 7 3 is seated in one of the notches 78. in the slot Z4 as shown in Fig. 4. i rod 79 is connected at its forward end to the Alock lever 'l5 and at thev rear end is connected to stud 8O on bell crank lever 52 (see Figs. 1 and 2). 'lie coi .ectioiis are such that when the shipper ha shown in lfigs. 2 and 4 the friction faces 70 and 71 will be held together tightly to cause the looni to operate. A collar 81 adjustably secured to rod? is positioned to engage the lower end of the shipper handle 2 when said rod 6'? moves forwardly under the action of spring 55. This latter movement will occur when brake handle 60 moves from the position shown in Fig. 4 to that shown in Fig. 6. The driving mechanism is of the cenimon form and it will be noted that the shipper handle will inove to the stopping position as shown in Fig. 5 without setting the main brake, the band 57 being held away from the drum 59 so long as brake lever 60 is in forward position irrespective of the position of the shipper handle.

fis previously stated looms constructed substantially as described with the roller bearings are found to run so easily that it is difficult to keep the lay in forward position at the time afault in the wai'pVV is being mended. ln order to hold the lay in is in the forward position y lever 90 with the shipper handle 72 is such that when the latter is in driving position as shown in Figs. 2 and 4i the braking` face 92 will. be spaced from the drum 59 but when the shipper handle moves to the, position shown in Figs. 5 or 6 the rod79 will move ,forwardly to rock the auxiliary brake to the position shown in Fig. 3. This applies a very light friction on. thedrum 59 sufhcient to stop the loom in slightly less than half a pick so that if the weaver throws the shipper handle when the lay is in its rearward position said lay will be brought to rest a short distance before it reaches the forward limit of its movement. The auxiliary brake will serve also to hold the lay in its forward position and prevent undesirable raising of the filling fork 31.

It will be noted that the auxiliary brake is applied to the drum whenever'the shipper handle is` moved to off position. The auxiliary brake is also under control of the brake lever 60 by reason of the fact that when the latter is moved from the position shown in Fig. 4 to that shown in Fig. 6 the collar 8l advances to unseat the pin 73 from its adjacent notch 78 andmove the shipper handle backwardly to the position shown in Fig. 6. Obviously therefore, when it is desired to stop the loom quickly, as in the case of a misplaced shuttle or a filling break both the main brake and the auxiliary brake will be applied to drum 59.

When the loom has been stopped by the application of both brakes it is necessary first to take off the main or service brake 57 after which the shipper handle is thrown on, but during the interval of time lapsing between the manipulation of the handles the lay would move back unless the auxiliary brake were still on after the main brake had moved to non-braking position. Furthermore, the auxiliary brake is made light enough in its lbraking action to permit the weaver to turn the loom over by hand, an operation which would be diicult if the main brake were relied upon to prevent ret- .'ograde movement of the lay.

From the foregoing it will be Seen that I have provided an auxiliary brake to apply a light braking action whenever the shipper handle is moved to stop the loom and that this auxiliary brake, which can be*v controlled by the shipper at either end of the loom, is under the joint control of the shipper and brake handles and always operates when the main brake acts to stop the loom.y Furf thermore, the provision of the auxiliary brake which` permits a gradual. stopping of the loom instead of the abrupt stopping attending the operation of the main brake will preventl backward movement 'of thelay and undersirablel raising of the filling fork, thus obvia-ting the previouslyl described? shiners and at the same timev holding the lay infa position where the weaver can conveniently repair aA brake'- in the warp. Having thusdescribedmy invention it. will be apparent-that changes and modifications may be inadevtherein' bythose skilled in the art without departing from the spirit and scope'of the invention,`and VIv do not wish to be limited to the details herein disclosedV but what I claim. is: f l. In a loom, a driving shaft, a lay con nected thereto, means to drive the shaft, a pair of brakes both effective to resist motion of the shaft and lay, one of said brakes being relatively light and effective to offer slight resistance to movement of the lay and shaftA whenever the shaft and means to drivev are disconnected, and the other brake capable of remaining in non-braking position when the shaft and driving means therefor are disconnected, and operative connections between the brakes to cause the light brake to become operative to brake the shaft when the main brake is effective.

2. In aloom, a lay, a driving shaft connected thereto, a main brake to effect yrelatively quick stopping of the driving shaft, a brake handle to control said main brake, a shipper handle to control the running and stopping of. the loom, and a relatively light auxiliary brake eective to prevent retrograde movement of the shaft and lay, said auxiliary brake being under the joint control of the brake lever and the shipper handle. f

3. In a loom, a lay, a driving shaft connected thereto, a main brake to effect relatively quick stopping of the driving shaft, a brake handle tocontrol said main brake, a shipper handle to control the running and stopping of the loom, and a relatively light auxiliary brake effective to prevent retro grade movement of the shaft and lay, said auxiliary brake being under joint control of the brake lever and the shipper handle but being controlled by the shipper handle independently of the brake lever.

4;. In a loom, a shaft, a main brake for the shaft, an auxiliary brake for the shaft,

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a control member for the main brake, a

under the single control of the second named member when the main brake is in non-braking position.

5. In a loom, a lay, a filling stop motion thereon to stop the loom when a fault occurs in the filling and having a fork to tension the filling as the lay moves forwardly and to release the tension on the filling upon retrograde movement of the lay, a main brake normally in non-braking position when the loom is running but controlled by the filling stop motion to be effective to brake the loom when said filling stop motion operates, an auxiliary brake to be effective whenever the loom is at rest irrespective of the position of the main brake and effective to exert a light braking action on the lay to prevent retrograde movement thereof, and connections between the brakes to render both brakes operative when the illing' stop motion operates.

6. In a loom, a lay, a filling stop motion having a filling fork to tension the filling when the lay moves forwardly and operating to reduce the tension on the filling upon retrograde movement of the lay, a main brake normally in non-braking position when the loom is ruiming and operable by the filling stop motion to move to braking position when the filling stop motion operates, shipper mechanism operable independently of the main brake to stop the loom, an auxiliary brake operative whenever the shipper mechanism is moved to Ystop .the loom to exert a light braking action on the lay irrespective of thek position of the main brake, and connections between the main brake and the auxiliary brake to render the latter operative whenever the main brake is operative.

in testimony' whereof I have hereunto afiixed ymy signature.

BENJAMIN MGGUINESS. 

